/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Returns an array with all granted ability handles NOTE: currently this doesn't include abilities that are mid-activation
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, BlueprintPure=false, Category="Gameplay Abilities") void GetAllAbilities ( [TArray](API\Runtime\Core\Containers\TArray)< [FGameplayAbilitySpecHandle](API\Plugins\GameplayAbilities\FGameplayAbilitySpecHandle) > & OutAbilityHandles ) const